Manifestation of the Purcell Effect in Current Transport through a Dot–Cavity–QED System

Nanomaterials

Chi-Shung Tang¹  NzarRauf Abdullah²  Andrei Manolescu³  Vidar Gudmundsson⁴ 

[1] Department of Mechanical Engineering, National United University, 2, Lienda, Miaoli 36063, Taiwan;Physics Department, College of Science, University of Sulaimani, Sulaimani 46001, Kurdistan Region, Iraq;School of Science and Engineering, Reykjavik University, Menntavegur 1, IS-101 Reykjavik, Iceland;Science Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavik, Iceland;

关键词: quantum transport;    quantum dot;    cavity-quantum electrodynamics;    quantum master equation;    electro-optical effects;   

DOI  :  10.3390/nano9071023

来源: DOAJ

【 摘 要 】

We study the transport properties of a wire-dot system coupled to a cavity and a photon reservoir. The system is considered to be microstructured from a two-dimensional electron gas in a GaAs heterostructure. The 3D photon cavity is active in the far-infrared or the terahertz regime. Tuning the photon energy, Rabi-resonant states emerge and in turn resonant current peaks are observed. We demonstrate the effects of the cavity−photon reservoir coupling, the mean photon number in the reservoir, the electron−photon coupling and the photon polarization on the intraband transitions occurring between the Rabi-resonant states, and on the corresponding resonant current peaks. The Rabi-splitting can be controlled by the photon polarization and the electron−photon coupling strength. In the selected range of the parameters, the electron−photon coupling and the cavity-environment coupling strengths, we observe the results of the Purcell effect enhancing the current peaks through the cavity by increasing the cavity−reservoir coupling, while they decrease with increasing electron−photon coupling. In addition, the resonant current peaks are also sensitive to the mean number of photons in the reservoir.

【 授权许可】

Unknown